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Improve Schema Stitching example (#403)

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* Improve Schema Stitching example

* Fix prettier
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Arda TANRIKULU 2022-09-24 12:26:04 +03:00 committed by GitHub
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41
packages/web/docs/pages/features/registry-usage.mdx
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@ -69,32 +69,43 @@ HIVE_CDN_ENDPOINT="..." HIVE_CDN_KEY="..." ./router
## Schema Stitching
Stitching could be done in many ways, that's why `@graphql-hive/client` provides generic functions, not something dedicated for stitching. Unfortunately the implementation of gateway + polling is up to you.
Stitching could be done in many ways, that's why `@graphql-hive/client` provides generic functions, not something dedicated for stitching. Unfortunately the implementation of gateway is up to you.
Here's an example of how it could work
```typescript
import { createServicesFetcher } from '@graphql-hive/client'
import { stitchSchemas } from '@graphql-tools/stitch'
import { UrlLoader } from '@graphql-tools/url-loader'
import { buildSchema } from 'graphql'
import { createServer } from '@graphql-yoga/node'
const urlLoader = new UrlLoader()
const fetchServices = createServicesFetcher({
endpoint: process.env.HIVE_CDN_ENDPOINT,
key: process.env.HIVE_CDN_KEY
})
startMyGraphQLGateway({
// a function that resolves a list of services to stitch them together
async stitchServices() {
const services = await fetchServices()
async function main() {
const services = await fetchServices()
const subschemas = services.map(service => {
return {
schema: buildSchema(service.sdl),
executor: urlLoader.getExecutorAsync(service.url)
}
})
const schema = stitchSchemas({
subschemas
})
return services.map(service => {
return {
sdl: service.sdl,
url: service.url,
checksum: service.id // to check if service's schema was modified
}
})
},
pollingInSec: 10 // every 10s
const server = createServer({ schema })
await server.start()
}
main().catch(err => {
console.error(err)
process.exit(1)
})
```
@ -103,8 +114,6 @@ startMyGraphQLGateway({
The `createServicesFetcher` factory function returns another function that is responsible for fetching a list of services from Hive's high-availability endpoint..
The `startMyGraphQLGateway` represents your GraphQL gateway with built-in polling mechanism, in which the `stitchServices` method is called every 10 seconds.
## Other tools
Here's a list of available endpoints: